1. Effects of post-core design and ferrule on fracture resistance of endodontically treated maxillary central incisors.
- Author
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Zhi-Yue L and Yu-Xing Z
- Subjects
- Analysis of Variance, Chi-Square Distribution, Composite Resins chemistry, Crowns, Dental Porcelain chemistry, Dental Restoration Failure, Dental Stress Analysis instrumentation, Humans, Matched-Pair Analysis, Materials Testing, Maxilla, Metal Ceramic Alloys chemistry, Root Canal Preparation, Statistics, Nonparametric, Stress, Mechanical, Surface Properties, Dental Prosthesis Design, Incisor pathology, Post and Core Technique, Tooth Fractures physiopathology, Tooth, Nonvital rehabilitation
- Abstract
Statement of Problem: Studies concerning the effects of post-core design and ferrule on the fracture resistance of endodontically treated teeth remain controversial., Purpose: The purpose of this study was to investigate in vitro the effects of post-core design and ferrule on the fracture resistance of root canal treated human maxillary central incisors restored with metal ceramic crowns., Material and Methods: Forty-eight extracted human maxillary central incisors were endodontically treated and divided into 4 groups of 12. The following treatments were evaluated: group A: restored with metal ceramic (porcelain fused to metal [PFM]) crowns as control; group B: 2-mm ferrule/custom cast post-core/PFM crowns; group C: no ferrule/custom cast post-core/PFM crowns; and group D: 2-mm ferrule/prefabricated post and resin core/PFM crowns. Each specimen was subjected to load (N) on the lingual surface at a 135-degree angle to the long axis with a MTS 810 material testing machine until fracture at a crosshead speed of 0.02 cm/min. One-way analysis of variance and nonparametric chi-square test were used to compare the results. A significant analysis of variance result was followed by Newman-Keuls pairwise multiple comparisons (P<.05)., Results: There were significant differences among the 4 groups studied (P<.01). Group B had the highest fracture strength (1793.59 +/- 387.93 N). There was no significant difference among the fracture resistances of the other 3 groups (group A: 958.49 +/- 286.02 N; group C: 992.98 +/- 291.00 N; group D: 994.94 +/- 285.04 N)., Conclusion: Within the limitations of this study, not all of the post-core structures tested improved the strength of the endodontically treated teeth. Those prepared with a 2-mm dentin ferrule more effectively enhanced the fracture strength of custom cast post-core restored endodontically treated maxillary central incisors.
- Published
- 2003
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